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Feed efficiency, growth performance, and carcass characteristics of a fast- and a slower-growing broiler hybrid fed low- or high-protein organic diets

Rezaei, Mehdi and Yngvesson, Jenny and Gunnarsson, Stefan and Jönsson, Lotta and Wallenbeck, Anna (2017). Feed efficiency, growth performance, and carcass characteristics of a fast- and a slower-growing broiler hybrid fed low- or high-protein organic diets. Organic Agriculture. 7, 1-8
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Official URL: https://dx.doi.org/10.1007/s13165-017-0178-6

Abstract

Organic poultry meat production in Sweden is characterized by diets based on organic and locally produced feedstuffs, roughage allowance, a long rearing period (>10 weeks), outdoor access for the birds, and ban of synthetic amino acids and prophylactic use of antibiotics and anthelmintic. Until recently, the main hybrids used in organic broiler chicken production in Sweden were the same as used in conventional broiler chicken production. These birds are bred to reach market weight at 5 to 6 weeks on a high-protein quality nonorganic diet. In this study, organic high- and low-
protein diets were fed to fast- and slower-growing hybrid broiler chickens with 5 pens per genotype × diet treatment and 21 to 22 broiler chickens per pen. Weight gain, feed conversion, health, and mortality were recorded during a 71-day rearing period. The fast-growing hybrid birds grew faster (55.4 ± 0.7 versus 38.3 ± 0.5 g/day, P = 0.001) and had a better feed conversion ratio (2.6 ± 0.1 versus 2.9 ± 0.1 kg feed/kg body weight, P = 0.001) than the slower-growing hybrid birds. The fast-growing hybrid birds grew slower when fed the high-protein compared to the low-protein diet (55.3 ± 0.5 versus 57.8 ± 1.4 g/day, P = 0.050), while the slower-
growing hybrid birds grew faster when fed the high-protein compared to the low-protein diet (39.4 ± 0.7 and 37.2 ± 0.4 g/day, P = 0.038). A higher proportion of fast- compared to slower-growing hybrid birds had sticky droppings at 1 week of age (18.8 ± 1.6 versus 3.8 ± 1.6%, P = 0.001) and were culled because of leg weakness during the 10-week rearing period (10.0 ± 2.0 versus 3.3 ± 2.0%, P = 0.031), indicating poorer welfare among fast-growing hybrid birds when reared for 10 weeks on organic diets.

Authors/Creators:Rezaei, Mehdi and Yngvesson, Jenny and Gunnarsson, Stefan and Jönsson, Lotta and Wallenbeck, Anna
Title:Feed efficiency, growth performance, and carcass characteristics of a fast- and a slower-growing broiler hybrid fed low- or high-protein organic diets
Series/Journal:Organic Agriculture (1879-4246)
Year of publishing :2017
Volume:7
Page range:1-8
Number of Pages:8
Publisher:Springer
ISSN:1879-4246
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 403 Veterinary Science > Other Veterinary Science
Agrovoc terms:poultry farming, feed composition, feed conversion efficiency, organic agriculture
Keywords:Broiler, Growth, Mortality, Organic, Protein content
URN:NBN:urn:nbn:se:slu:epsilon-e-4604
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4604
Additional ID:
Type of IDID
DOI10.1007/s13165-017-0178-6
ID Code:14901
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
VH - Faculty of Veterinary Medicine and Animal Science
Department:(NL, NJ) > Institutionen för husdjursgenetik (fr.o.m. 960101)
(VH) > Dept. of Animal Nutrition and Management
(VH) > Dept. of Animal Breeding and Genetics
Deposited By: SLUpub Connector
Deposited On:18 Jan 2018 11:58
Metadata Last Modified:18 Jan 2018 11:58

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